# SD Card

A micro SD card is required to use custom [configurations](/r2d2/platforms/embedded/sd-card/config.txt.md), to play [WAV files](#wav-files), and to store [vocalizer settings](/r2d2/platforms/embedded/sd-card/r2d2vocalizer.txt.md) — such as vocalizations saved to [memory](/r2d2/features/memory.md) — between sessions. Without an SD card, this information will be lost every time the Teensy is powered off.

An SD card rated [V30 or faster](https://www.sdcard.org/developers/sd-standard-overview/speed-class/) is required for playing WAV files.

{% hint style="warning" %}
The card must be formatted as FAT16 or FAT32. Windows 11 no longer natively supports FAT formatting for cards larger than 32 GB, so you will need a 3rd party tool such as MiniTool Partition Wizard.
{% endhint %}

{% hint style="warning" %}
The SD card must be inserted into the reader on the Teensy itself as shown below— *NOT* the reader on the Audio Adapter.
{% endhint %}

<figure><img src="/files/QT5D8zzpRRcdEACCLYk5" alt=""><figcaption><p>Insert the SD card into the reader on the Teeny</p></figcaption></figure>


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